wide terminal type flat chip resistors
EU
features
• Wide-side termination (reverse-geometry)
type flat chip resistor
• High reliability and performance with T.C.R.
±100 x 10-6/K, resistance tolerance ±0.5%
• Products with lead-free terminations meet EU RoHS
requirements. EU RoHS regulation is not intended for
Pb-glass contained in electrode, resistor element and glass.
• AEC-Q200 Tested
Dimensions inches (mm)
W
c
d
Type
dimensions and construction
L
c
L
1E
(0204)
1J
(0306)
2A
(0508)
.020±.002
(0.5±0.05)
.031±.004
(0.8±0.1)
.049±.006
(1.25±0.15)
.039±.002
(1.0±0.05)
.063±.004
(1.6±0.1)
.079±.006
(2.0±0.15)
.006±.002
(0.15±0.05)
.006±.004
(0.15±0.1)
.012±.008
(0.3±0.2)
.006±.002
(0.15±0.05)
.008±.004
(0.2±0.1)
.014±.008
(0.35±0.2)
2B
(0612)
2H
(1020)
2J
(1218)
3A
(1225)
.063±.006
(1.6±0.15)
.098±.006
(2.5±0.15)
.122±.006
(3.1±0.15)
.122±.006
(3.1±0.15)
.126±.008
(3.2±0.2)
.197±.006
(5.0±0.15)
.181±.006
(4.6±0.15)
.252±.006
(6.3±0.15)
.012±.008
(0.3±0.2)
.016±.008
(0.4±0.2)
.016±.008
(0.4±0.2)
.018±.008
(0.45±0.2)
.018±.006
(0.45±0.15)
c
W
Solder
Plating
Ni
Plating
t
d
Inner
Resistive Electrode
Film
t
(Inch Size Code)
Protective
Coating Ceramic
Substrate
Derating Curve
.014±.002
(0.35±0.05)
.018±.004
(0.45±0.1)
.022±.004
(0.55±0.1)
.024±.004
(0.6±0.1)
.030±.006
(0.75±0.15)
WK73R2B (1W), WK73R3A (2W)
100
100
80
80
100
60
40
1E, 1J, 2A, 2B,
2H, 3A (125°C)
60
40
20
20
0
-60 -40 -20
-55
80
% Rated Power
% Rated Power
% Rated Power
2J (100°C)
0
80 100 120 140 160
155
70
Ambient Temperature
(°C)
20
40
60
For resistors operated at an ambient temperature
of 70°C or above, a power rating shall be derated
in accordance with the above derating curve.
ordering information
WK73R
2J
Type
Size
WK73R
1E: 0.33W
1J: 0.5W
2A: 0.75W, 1W
2B: 0.75W, 1W
2H: 1W
2J: 1W
3A: 1.5W, 2W
T
Termination
Material
T: Sn
2B, 3A (115°C)
60
40
20
0
-60 -40 -20
-55
80 100 120 140 160
125
155
Terminal Part Temperature
(°C)
0
20
40
60
0
-60 -40 -20
-55
0
20
40
60
80
100 120 140 160
115
155
Terminal Part Temperature
(°C)
For resistors operated terminal temperature of described for each size or above, a power rating
shall be derated in accordance with the derating curve above.
Please refer to “Introduction of the derating curve based on the terminal part temperature” in the
beginning of our catalog before use.
If you want to use at rated power (*1), use derating curves based on the terminal part temperature
on the right side graph.
TE
Packaging
TP: 0204: 7" 2mm pitch
punched paper
TD: 0306, 0508, 0612: 7"
4mm pitch punched paper
TE: 1020, 1218, 1225:
7" embossed plastic
For further information on
packaging, please refer
to Appendix A
33L0
Nominal
Resistance
±1%: 3 significant figures + 1
multiplier “R” indicates decimal
on value
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